Those with long memories will recall the economic war of the nineteen thirties where the Irish Gov refused to pay the annuity money to the British Gov saying they were due to the Irish Gov (Dev was responsible for this). Britain retaliated by refusing to buy Irish beef. As a consequence, the Irish herd was culled with no market. Come 1939, Britain decided to begin buying Irish beef again because of the war. Unfortunately, they were too late - there was no beef.
Let us hope history is not repeated.
Back then we didn't have a world wide market.
More recently we've been able to export beef to markets like the Middle East which the UK couldn't because of politics.
Also the drop in sterling makes the UK less attractive to our exporters.